High Speed grinder

[Chris Vandiver]

I have a Baldor 6" high speed grinder. Does anyone know if it's possible to slow it down(to say, 1750rpms)without harming the motor?

[Greg R Bradley]

Assuming US 60Hz power:

A 3600rpm induction motor, which runs about 3450rpm at rated load, has 2 poles on the armature. A 1800rpm induction motor, which runs about 1725rpm at rated load, has 4 poles on the armature.

You can't change the number of poles on the armature, so your only option is to feed it 30Hz electricity. Not impossible but pretty difficult.

[Ryan Baker]

Are you trying to slow it down for sharpening? If so, I honestly don't think it really makes that much difference to be worth trying to slow it down ... especially since the rim speed on a 6" wheel isn't that fast compared to larger grinders. I'd leave it and learn to use a lighter touch, which you still need at 1750.

[John McClanahan]

Simple answer is no. It is what it is.

[Chris Vandiver]

Thanks for the replys, everyone. I was just checking.